多线程安全的vector设计---借助thread_local变量 thread_local变量简介 thread_local是C++11之后才引入的关键字。thread_local变量与其所在线程同步创建和销毁,并且只能被创建它的线程所访问,也就是说thread_local变量是线程安全的。每个线程在自身TIB(Thread Information Block)中存储thread_local变量的副本。 基于thread_...
std::vector<int> a(N), b(N); ... cilk_for (int i = 1; i < N; i++) { a = 2*i; b = b[i-1] + a; } So, in summary, you can use the vector operation in your example "data = x" if "i" is the loop control variable, but you need to make sure there is no ...
求助,std::ve..如题,编译器为mingw,未使用cmake,其他都好好的,补充:vs2022中可运行,如果gcc实在不行,如何在vscode中设置与vs2022一样的环境(编译选项)呢
#include<iostream>#include<thread>#include<string>#include<vector>voidcompute(intnIters){for(intiter=0;iter<nIters;++iter){std::cout<<" iter = "<<iter+1<<" nIters = "<<nIters<<std::endl;std::this_thread::sleep_for(std::chrono::milliseconds(500));}std::cout<<"The computation i...
:atomic#include<thread> // std::thread#include<vector> // std::vector// a simple global...
#include <thread> // std::thread, std::this_thread::yield #include <vector> // std::vector // 由 false 初始化一个 std::atomic<bool> 类型的原子变量 std::atomic<bool> ready(false); std::atomic_flag winner = ATOMIC_FLAG_INIT; void do_count1m(int id) { while (!ready) { std::...
auto upv = std::make_unique<std::vector<int>>(10, 20); auto spv = std::make_shared<std::vector<int>>(10, 20); 结果指针是指向一个10个元素的数组每个元素值是20,还是指向2个元素的数组其值分别是10和20 ?或者无限制? 好消息是并非无限制的 :两个调用都是构造了10元素的数组,每个元素值都...
std::vector<int> v = ...; std::vector<int>::const_iterator cit = v.cbegin(); // vs. auto cit = v.cbegin(); Functions can also deduce the return type using auto. In C++11, a return type must be specified either explicitly, or using decltype like so: template <typename X, typ...
main() { (*safe_map_strings_global)["apple"] = 0; (*safe_map_strings_global)["potato"] = 0; std::vector<std::thread> vec_thread(10); for (auto &i : vec_thread) i = std::move(std::thread([&]() { func(safe_map_strings_global); })); for (auto &i : vec_thread) i...
classvector{ public: typedefT value_type; ... protected: //专属之空间配置器,每次配置一个元素大小 typedefsimple_alloc<value_type,Alloc> data_allocator; ... }; 其中第二个tmplate参数所使用的缺省参数alloc,可以是第一级配置器也可以是第二级配置器。不过,SGI STL已经把它设为第二级配置器。